Mine is iPhone6+ OS 11.4.1. Same issue as you (and others).
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This has been happening to me for a while now. At first I wasn't sure, but now it is clear that the messages are disappearing. I get a notification, I look at my phone, I see a text and can read the initial section, I unlock my phone, the text is nowhere to be found. This is happening for work and has lead to several upset clients and lost business. Please help solve this.
Have also submitted bug report to Apple.
Mine was already on persistant so it probably will not help. I wish they
would fix this problem. I also submitted a bug report. Good luck!
On Fri, Aug 24, 2018 at 8:10 AM Apple Support Communities <
Mine too, getting tired of turning my phone on to watch txt messages dissapear 😕 i hope they fix it.
I turn it off so it doesn’t disturb me or my family. I will try airplane mode. Lost amother one this morning after I toggled history off. Also have the new uograde. Nothoid Apple . Very unimpressed
Why are text messages disappearing